user's manual - Ana-Digi Systems
user's manual - Ana-Digi Systems
user's manual - Ana-Digi Systems
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
CHAPTER 8 INSTALLATION AND STARTUP<br />
8.1.2 Cable installation<br />
For Profibus cable, the Shielded Twisted Pair Cable should be used. Table 8.1 and Table 8.2<br />
shows cable specification and max. transmission distance according to speed and cable type.<br />
Cable characteristic Type A Type B<br />
Impedance<br />
135 – 165 Ω<br />
(f= 3 to 20 MHz)<br />
100 – 130 Ω<br />
(f > 100 KHz)<br />
Capacity < 30 pF/m < 60 pF/m<br />
Resistance < 110 Ω/Km -<br />
Conductor Area >= 0.34 mm 2 (22 AWG) >= 0.22 mm 2 (24 AWG)<br />
Table 8.1 Cable Specifcation<br />
Baud rate<br />
(kbit/s)<br />
9.6 19.2 93.75 187.5 500 1500 3000 6000 12000<br />
Cable Type A 1200 1200 1200 1000 400 200 100 100 100<br />
Cable Type B 1200 1200 1200 600 200 70 - - -<br />
Table 8.2 Transmission distance according to Cable and Speed<br />
Note) For Transmission distance, assuming that max. signal attenuation is 6dB.<br />
1) General notices<br />
• Termination treatment of vertical section is needed.<br />
• In case that the distance is far between stations, it is possible to extend the segment through<br />
repeater. (max. 9 repeater, 10 segment), available to connect 32 stations per segment (incl.<br />
repeater), max. 126 stations.(Repeater does not have station no.). The extended segment<br />
having no station is available.<br />
• Generally, connect the red cable to no.3 pin TXD/RXD-positive and the green cable to no.8<br />
pin TXD/RXD-negative. Shield shall be connected to the housing of connector.<br />
• Use the cable that shield density is more than 80%.<br />
• The ends of cable shield should be grounded.<br />
• If the ground potential difference between stations is big, a great amount of current may flow<br />
through the shield. In this case, install the cable to make the ground potential difference<br />
equal separately.<br />
For high speed more than 1.5MBps, special cares should be taken.<br />
• Use the special connector having the inductor inside.<br />
• Spur Line is not allowed to use.<br />
• In case of 12Mbps, keep the distance more than 1m between stations.<br />
8-2